I know a commercial guy that sells a couple of thousand nucs every year. His nucs include bees box and frames. The boxes are made from an osb product that is prepainted. The bees are healthy and the boxes look good.

Steve

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Even painted I don't think I would use it up her in the Pacific Northwest, maybe for temp nucs, it cannot handle prying the frames out, if not protected on all sides will absorb moisture. AND not sure what type of glue they use to make it.